kernel/git/stable/linux.git/arch/sh/mm/pg-sh4.c, branch master

sh: Use the now generic SH-4 clear/copy page ops for all MMU platforms.

2009-07-27T12:30:17+00:00

Now that the SH-4 page clear/copy ops are generic, they can be used for all platforms with CONFIG_MMU=y. SH-5 remains the odd one out, but it too will gradually be converted over to using this interface. SH-3 platforms which do not contain aliases will see no impact from this change, while aliasing SH-3 platforms will get the same interface as SH-4. Signed-off-by: Paul Mundt

sh: wire up clear_user_highpage() for sh4, convert sh7705.

2009-07-27T11:53:22+00:00

This wires up clear_user_highpage() on SH-4 and subsequently converts the SH7705 32kB cache mode over to using it. Now that the SH-4 implementation handles all of the dcache purging directly in the aliasing case, there is no need to do this in the default clear_page() implementation. Signed-off-by: Paul Mundt

sh: Migrate from PG_mapped to PG_dcache_dirty.

2009-07-22T10:20:49+00:00

This inverts the delayed dcache flush a bit to be more in line with other platforms. At the same time this also gives us the ability to do some more optimizations and cleanup. Now that the update_mmu_cache() callsite only tests for the bit, the implementation can gradually be split out and made generic, rather than relying on special implementations for each of the peculiar CPU types. SH7705 in 32kB mode and SH-4 still need slightly different handling, but this is something that can remain isolated in the varying page copy/clear routines. On top of that, SH-X3 is dcache coherent, so there is no need to bother with any of these tests in the PTEAEX version of update_mmu_cache(), so we kill that off too. Signed-off-by: Paul Mundt

sh: Handle fixmap TLB eviction more coherently.

2008-11-10T11:00:45+00:00

There was a race in the kmap_coherent() implementation. While we guarded against preemption, there was nothing preventing eviction of the pre-faulted fixmap entry from the UTLB. Under certain workloads this would result in the fixmap entries used for cache colouring being evicted from the UTLB in the midst of a copy_page(). In addition to pre-faulting, we also make sure to preserve the PTEs in the kernel page table and introduce a cached PTE for kmap_coherent() usage. This follows a similar change on MIPS ("[MIPS] Fix aliasing bug in copy_to_user_page / copy_from_user_page"). Reported-by: Hideo Saito Reported-by: CHIKAMA Masaki Tested-by: Yoshihiro Shimoda Signed-off-by: Paul Mundt

sh: fix pg-sh4.c build breakage in linux-next

2008-07-28T09:10:34+00:00

Remove inline from ptep_get_and_clean() to match with header file prototype. Makes linux-next build. Signed-off-by: Magnus Damm Signed-off-by: Paul Mundt

sh: Optimized copy_{to,from}_user_page() for SH-4.

2007-11-07T02:14:12+00:00

This moves copy_{to,from}_user_page() out-of-line on SH-4 and converts for the kmap_coherent() API. Based on the MIPS implementation. Signed-off-by: Paul Mundt

sh: Wire up clear_user_highpage().

2007-11-07T02:14:12+00:00

With the kmap_coherent() API in place, this is trivial to implement, and lets us avoid the cache flush in certain cases. Signed-off-by: Paul Mundt

sh: Fix fs.h removal from mm.h regressions.

2007-07-31T04:01:43+00:00

Signed-off-by: Paul Mundt

sh: Add kmap_coherent()/kunmap_coherent() interface for SH-4.

2007-07-24T04:28:26+00:00

This wires up kmap_coherent() and kunmap_coherent() on SH-4, and moves away from the p3map_mutex and reserved P3 space, opting to use fixmaps for colouring instead. The copy_user_page()/clear_user_page() implementations are moved to this, which fixes the nasty blowups with spinlock debugging as a result of having some of these calls nested under the page table lock. Signed-off-by: Paul Mundt

sh: Revert lazy dcache writeback changes.

2007-03-05T10:46:47+00:00

These ended up causing too many problems on older parts, revert for now.. Signed-off-by: Paul Mundt